Cardiac reconstruction for photon counting CT for heart and lung images

a technology of photon counting and cardiac reconstruction, applied in the field of computed tomography, can solve the problems of limited count rate of photon counting detector pixels, and may not be well-suited for high-flux cardiac ct studies,

Active Publication Date: 2017-10-03
KONINKLJIJKE PHILIPS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This approach enhances the signal-to-noise ratio for cardiac imaging while minimizing artifacts in lung and peripheral volumetric image data, reducing subject dose and maintaining diagnostic quality.

Problems solved by technology

Unfortunately, photon counting detector pixels have a limited count rate.
As a consequence, a CT scanner configured with photon counting detector pixels may not be well-suited for high flux cardiac CT studies.

Method used

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  • Cardiac reconstruction for photon counting CT for heart and lung images
  • Cardiac reconstruction for photon counting CT for heart and lung images
  • Cardiac reconstruction for photon counting CT for heart and lung images

Examples

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Embodiment Construction

[0019]FIG. 1 schematically illustrates an example imaging system 100, such as a computed tomography (CT) scanner. The imaging system 100 includes a rotating gantry 102 and a stationary gantry 104. The rotating gantry 102 is rotatably supported by the stationary gantry 104. The rotating gantry 102 is configured to rotate around an examination region 106 about a longitudinal or z-axis. The imaging system 100 further includes a subject support 107 that supports a subject or object in the examination region 106 before, during and / or after scanning. The subject support 107 can also be used to load and / or unload the subject or object into or from the examination region 106.

[0020]In the illustrated example, a cardiac cycle monitor 108 and a feature identifier 110 are employed with the example imaging system 100 for cardiac scans. In one instance, the cardiac cycle monitor 108 and / or the feature identifier 110 are part of the imaging system 100. In another instance, the cardiac cycle monito...

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Abstract

A method includes modulating a flux of emission radiation between a first lower flux level and a second higher flux level in coordination with a cardiac cycle signal so that the flux is at the first lower flux level during a first cardiac motion phase having a first higher cardiac motion and is at the second higher flux level during a second cardiac motion phase having a second lower cardiac motion. The method further includes reconstructing the projection data with a first reconstruction window, which applies a first higher weight to a first sub-set of the projection data that corresponds to the first cardiac motion phase and the lower first flux level and a second lower weight to a second sub-set of the projection data that corresponds to the second cardiac motion phase and the higher second flux level, to generate first volumetric image data.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is the U.S. National Phase application under 35 U.S.C. §371 of International Application No. PCT / IB2015 / 057791, filed Oct. 12, 2015, published as WO 2016 / 063171 on Apr. 26, 2016, which claims the benefit of U.S. Provisional Patent Application No. 62 / 065,939 filed Oct. 20, 2014. These applications are hereby incorporated by reference herein.FIELD OF THE INVENTION[0002]The following generally relates to cardiac imaging with a photon counting detector, and is described with particular application to computed tomography (CT). However, the following is also amenable to other imaging applications.BACKGROUND OF THE INVENTION[0003]A computed tomography (CT) scanner includes an x-ray tube that emits x-ray radiation. The radiation traverses a subject or object located in a field of view and is attenuated thereby. A detector array detects the radiation traversing the field of view and produces a signal indicative thereof. A reconstr...

Claims

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Application Information

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Patent Type & AuthorityPatents(United States)
IPC IPC(8): A61B6/03A61B6/00
CPCA61B6/5205A61B6/032A61B6/405A61B6/4241A61B6/503A61B6/5258A61B6/5288A61B6/541A61B6/50
InventorPROKSA, ROLANDKOEHLER, THOMASGRASS, MICHAEL
OwnerKONINKLJIJKE PHILIPS NV